To say that public transit is heavily subsidized ignores that the alternative, building new roads, parking, bridges, and other infrastructure is even more expensive. And it ignores how much regular road use is subsidized.
Not to forget that the escalating climate change tax on petrol was paused some years back.
https://www.theguardian.com/environment/2019/jan/23/uk-has-b...
Taxing something less is not the same as subsidising it and it is disingenuous to claim that it is. Is the government subsidising you by taxing you less than some hypothetical percentage?